lately im getting doffs from duty officer exchange or Asylum missions that only have one Trait . is this intended? i find it hard that a rare officer only has 1 trait making them rather useless or a candidate for the next Exchange assignment.

I've had most of my single trait DOFFs for a while so not 100% on where many of them came from, but here we go:

Zayerroov
Rigelian - Very Rare - Research Lab Scientist
Traits: Spiritual
I think I got him from the 5:1 DOFF Compactor

Tirin
Trill - Very Rare - Botonist
Traits: Teamwork - Specializes in using others to pull him to the top... :-|
I did get him from Trill Asylum - Quite possibly one of the most worthless Very Rares I have based on Traits and Specialization

Simil Pitaddla
Betazoid - Rare - Chef
Traits: Telepathic - I guess he had mental blackmail :-P
Not sure where he came from

The rest have probably ended up being "compacted". And I can see where Commons and even Uncommons might have only one trait, but when you start getting into Rare and especially Very Rare it is ridiculous to think you would only have one trait